Alert archive / Maryland / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

June 28, 2020Kent County, New Castle County, Delaware; 4 counties in Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 28, 2020, 6:41 PM EDT for Kent County, New Castle County, Delaware; 4 counties in Maryland. It was in force for 34 min. 14 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 28, 2020, 6:41 PM EDT (22:41 UTC)
Expired: Jun 28, 2020, 7:15 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Kent County, DE, New Castle County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 64 km from the middle of the area, began a volume at 22:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jun 28, 6:41 PM EDT	TSTM WND GST 79	2 Nw Galena, MD
Jun 28, 6:42 PM EDT	TSTM WND DMG	2 Nnw Morgnec, MD	DOWNED POWER LINES IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 28, 6:57 PM EDT	TSTM WND DMG	Crumpton, MD	DOWNED POWER LINES REPORTED IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 28, 6:57 PM EDT	TSTM WND DMG	Crumpton, MD	DOWNED POWER LINES REPORTED IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 28, 7:00 PM EDT	HAIL 0.25	1 Se Crumpton, MD	MPING REPORT. TIME ESTIMATED FROM RADAR.
Jun 28, 7:00 PM EDT	HAIL 0.25	1 Se Crumpton, MD	MPING REPORT. TIME ESTIMATED FROM RADAR.
Jun 28, 7:02 PM EDT	TSTM WND DMG	3 Sw Crumpton, MD	DOWNED POWER LINES IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 28, 7:02 PM EDT	TSTM WND DMG	3 Sw Crumpton, MD	DOWNED POWER LINES IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 28, 7:16 PM EDT	HAIL 0.25	2 W Sudlersville, MD	MPING REPORT.
Jun 28, 7:16 PM EDT	HAIL 0.25	2 W Sudlersville, MD	MPING REPORT.
Jun 28, 7:20 PM EDT	HAIL 0.5	2 W Sudlersville, MD	MPING REPORT.
Jun 28, 7:20 PM EDT	HAIL 0.5	2 W Sudlersville, MD	MPING REPORT.
Jun 28, 7:25 PM EDT	TSTM WND DMG	1 W Barclay, MD	MPING REPORT OF TREE LIMBS DOWN AND SHINGLES BLOWN OFF. TIME ESTIMATED FROM RADAR.
Jun 28, 7:25 PM EDT	TSTM WND DMG	1 W Barclay, MD	MPING REPORT OF TREE LIMBS DOWN AND SHINGLES BLOWN OFF. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.7 hours before the alert went out and 133 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 106 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1209 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

720 
WUUS51 KPHI 282241
SVRPHI
DEC001-003-MDC011-015-029-035-282315-
/O.NEW.KPHI.SV.W.0092.200628T2241Z-200628T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
641 PM EDT Sun Jun 28 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southwestern New Castle County in northern Delaware...
  Northwestern Kent County in central Delaware...
  Northeastern Queen Anne's County in northeastern Maryland...
  Northeastern Caroline County in eastern Maryland...
  Northeastern Kent County in northeastern Maryland...
  South central Cecil County in northeastern Maryland...

* Until 715 PM EDT.

* At 641 PM EDT, a severe thunderstorm was located over Kennedyville,
  or 14 miles southeast of Aberdeen Proving Ground, moving southeast
  at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Millington, Sudlersville, Morgnec, Delaney Corner, Massey,
  Crumpton, Kennedyville, Galena, Henderson, Marydel, Templeville and
  Barclay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3927 7608 3943 7597 3931 7567 3905 7576
TIME...MOT...LOC 2241Z 298DEG 21KT 3932 7595 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

JEO

2 follow-up statements

909 
WWUS51 KPHI 282259
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
659 PM EDT Sun Jun 28 2020

DEC003-MDC015-282309-
/O.CAN.KPHI.SV.W.0092.000000T0000Z-200628T2315Z/
New Castle DE-Cecil MD-
659 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NEW CASTLE AND
SOUTH CENTRAL CECIL COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3927 7608 3928 7597 3932 7582 3932 7576
      3929 7576 3930 7568 3905 7576
TIME...MOT...LOC 2259Z 302DEG 20KT 3924 7591 

$$

DEC001-MDC011-029-035-282315-
/O.CON.KPHI.SV.W.0092.000000T0000Z-200628T2315Z/
Kent DE-Queen Anne's MD-Caroline MD-Kent MD-
659 PM EDT Sun Jun 28 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHWESTERN KENT...NORTHEASTERN QUEEN ANNE'S...NORTHEASTERN
CAROLINE AND NORTHEASTERN KENT COUNTIES...

At 659 PM EDT, a severe thunderstorm was located over Crumpton, or 16
miles northeast of Centerville, moving southeast at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Millington, Sudlersville, Morgnec, Massey, Crumpton, Henderson,
Marydel, Templeville and Barclay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3927 7608 3928 7597 3932 7582 3932 7576
      3929 7576 3930 7568 3905 7576
TIME...MOT...LOC 2259Z 302DEG 20KT 3924 7591 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Staarmann

944 
WWUS51 KPHI 282307
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
707 PM EDT Sun Jun 28 2020

DEC001-MDC011-029-035-282316-
/O.EXP.KPHI.SV.W.0092.000000T0000Z-200628T2315Z/
Kent DE-Queen Anne's MD-Caroline MD-Kent MD-
707 PM EDT Sun Jun 28 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN KENT...
NORTHEASTERN QUEEN ANNE'S...NORTHEASTERN CAROLINE AND NORTHEASTERN
KENT COUNTIES WILL EXPIRE AT 715 PM EDT...
        
The storm which prompted the warning has partially moved out of the 
warned area. Therefore, the warning will be allowed to expire. 
However, a new warning is in effect for eastern portions of the 
previously warned area.

LAT...LON 3927 7608 3928 7597 3932 7582 3932 7576
      3929 7576 3930 7568 3905 7576
TIME...MOT...LOC 2306Z 298DEG 21KT 3923 7587 

$$

JEO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 5:37 PM EDT	Special Weather Statement	PHI	New Castle	38 min
Jun 28, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Kent	48 min
Jun 28, 7:40 PM EDT	Special Weather Statement	PHI	Kent	35 min
Jun 28, 6:16 PM EDT	Special Weather Statement	PHI	Kent	44 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2020 Severe Thunderstorm Warnings in Delaware, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.